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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
15ae422b LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2010 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
8 | under the terms of the GNU Lesser General Public License as published by |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
15ae422b LP |
10 | (at your option) any later version. |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 15 | Lesser General Public License for more details. |
15ae422b | 16 | |
5430f7f2 | 17 | You should have received a copy of the GNU Lesser General Public License |
15ae422b LP |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
19 | ***/ | |
20 | ||
21 | #include <errno.h> | |
07630cea | 22 | #include <sched.h> |
15ae422b | 23 | #include <stdio.h> |
07630cea LP |
24 | #include <string.h> |
25 | #include <sys/mount.h> | |
15ae422b | 26 | #include <sys/stat.h> |
07630cea | 27 | #include <unistd.h> |
25e870b5 | 28 | #include <linux/fs.h> |
15ae422b | 29 | |
b5efdb8a | 30 | #include "alloc-util.h" |
10404d52 | 31 | #include "base-filesystem.h" |
7f112f50 | 32 | #include "dev-setup.h" |
3ffd4af2 | 33 | #include "fd-util.h" |
d944dc95 | 34 | #include "fs-util.h" |
e908468b | 35 | #include "label.h" |
915e6d16 | 36 | #include "loop-util.h" |
07630cea LP |
37 | #include "loopback-setup.h" |
38 | #include "missing.h" | |
39 | #include "mkdir.h" | |
4349cd7c | 40 | #include "mount-util.h" |
3ffd4af2 | 41 | #include "namespace.h" |
07630cea | 42 | #include "path-util.h" |
d7b8eec7 | 43 | #include "selinux-util.h" |
2583fbea | 44 | #include "socket-util.h" |
8b43440b | 45 | #include "string-table.h" |
07630cea LP |
46 | #include "string-util.h" |
47 | #include "strv.h" | |
affb60b1 | 48 | #include "umask-util.h" |
ee104e11 | 49 | #include "user-util.h" |
07630cea | 50 | #include "util.h" |
15ae422b | 51 | |
737ba3c8 | 52 | #define DEV_MOUNT_OPTIONS (MS_NOSUID|MS_STRICTATIME|MS_NOEXEC) |
53 | ||
c17ec25e | 54 | typedef enum MountMode { |
15ae422b LP |
55 | /* This is ordered by priority! */ |
56 | INACCESSIBLE, | |
d2d6c096 LP |
57 | BIND_MOUNT, |
58 | BIND_MOUNT_RECURSIVE, | |
ac0930c8 LP |
59 | PRIVATE_TMP, |
60 | PRIVATE_VAR_TMP, | |
7f112f50 | 61 | PRIVATE_DEV, |
5d997827 | 62 | BIND_DEV, |
6c47cd7d | 63 | EMPTY_DIR, |
5d997827 LP |
64 | SYSFS, |
65 | PROCFS, | |
66 | READONLY, | |
59eeb84b | 67 | READWRITE, |
c17ec25e | 68 | } MountMode; |
15ae422b | 69 | |
34de407a | 70 | typedef struct MountEntry { |
5327c910 | 71 | const char *path_const; /* Memory allocated on stack or static */ |
cfbeb4ef | 72 | MountMode mode:5; |
5327c910 LP |
73 | bool ignore:1; /* Ignore if path does not exist? */ |
74 | bool has_prefix:1; /* Already is prefixed by the root dir? */ | |
cfbeb4ef | 75 | bool read_only:1; /* Shall this mount point be read-only? */ |
5327c910 | 76 | char *path_malloc; /* Use this instead of 'path' if we had to allocate memory */ |
d2d6c096 LP |
77 | const char *source_const; /* The source path, for bind mounts */ |
78 | char *source_malloc; | |
34de407a | 79 | } MountEntry; |
15ae422b | 80 | |
5d997827 LP |
81 | /* If MountAPIVFS= is used, let's mount /sys and /proc into the it, but only as a fallback if the user hasn't mounted |
82 | * something there already. These mounts are hence overriden by any other explicitly configured mounts. */ | |
83 | static const MountEntry apivfs_table[] = { | |
84 | { "/proc", PROCFS, false }, | |
85 | { "/dev", BIND_DEV, false }, | |
86 | { "/sys", SYSFS, false }, | |
87 | }; | |
f471b2af | 88 | |
11a30cec | 89 | /* ProtectKernelTunables= option and the related filesystem APIs */ |
34de407a | 90 | static const MountEntry protect_kernel_tunables_table[] = { |
c6232fb0 LP |
91 | { "/proc/sys", READONLY, false }, |
92 | { "/proc/sysrq-trigger", READONLY, true }, | |
93 | { "/proc/latency_stats", READONLY, true }, | |
94 | { "/proc/mtrr", READONLY, true }, | |
aa70f38b | 95 | { "/proc/apm", READONLY, true }, /* Obsolete API, there's no point in permitting access to this, ever */ |
c6232fb0 LP |
96 | { "/proc/acpi", READONLY, true }, |
97 | { "/proc/timer_stats", READONLY, true }, | |
98 | { "/proc/asound", READONLY, true }, | |
99 | { "/proc/bus", READONLY, true }, | |
100 | { "/proc/fs", READONLY, true }, | |
101 | { "/proc/irq", READONLY, true }, | |
102 | { "/sys", READONLY, false }, | |
103 | { "/sys/kernel/debug", READONLY, true }, | |
104 | { "/sys/kernel/tracing", READONLY, true }, | |
105 | { "/sys/fs/cgroup", READWRITE, false }, /* READONLY is set by ProtectControlGroups= option */ | |
3a0bf6d6 | 106 | { "/sys/fs/selinux", READWRITE, true }, |
11a30cec DH |
107 | }; |
108 | ||
c575770b | 109 | /* ProtectKernelModules= option */ |
34de407a | 110 | static const MountEntry protect_kernel_modules_table[] = { |
349cc4a5 | 111 | #if HAVE_SPLIT_USR |
c6232fb0 | 112 | { "/lib/modules", INACCESSIBLE, true }, |
c575770b | 113 | #endif |
c6232fb0 | 114 | { "/usr/lib/modules", INACCESSIBLE, true }, |
c575770b DH |
115 | }; |
116 | ||
b6c432ca DH |
117 | /* |
118 | * ProtectHome=read-only table, protect $HOME and $XDG_RUNTIME_DIR and rest of | |
119 | * system should be protected by ProtectSystem= | |
120 | */ | |
34de407a | 121 | static const MountEntry protect_home_read_only_table[] = { |
c6232fb0 LP |
122 | { "/home", READONLY, true }, |
123 | { "/run/user", READONLY, true }, | |
124 | { "/root", READONLY, true }, | |
b6c432ca DH |
125 | }; |
126 | ||
127 | /* ProtectHome=yes table */ | |
34de407a | 128 | static const MountEntry protect_home_yes_table[] = { |
c6232fb0 LP |
129 | { "/home", INACCESSIBLE, true }, |
130 | { "/run/user", INACCESSIBLE, true }, | |
131 | { "/root", INACCESSIBLE, true }, | |
b6c432ca DH |
132 | }; |
133 | ||
f471b2af | 134 | /* ProtectSystem=yes table */ |
34de407a | 135 | static const MountEntry protect_system_yes_table[] = { |
c6232fb0 LP |
136 | { "/usr", READONLY, false }, |
137 | { "/boot", READONLY, true }, | |
138 | { "/efi", READONLY, true }, | |
f471b2af DH |
139 | }; |
140 | ||
141 | /* ProtectSystem=full includes ProtectSystem=yes */ | |
34de407a | 142 | static const MountEntry protect_system_full_table[] = { |
c6232fb0 LP |
143 | { "/usr", READONLY, false }, |
144 | { "/boot", READONLY, true }, | |
145 | { "/efi", READONLY, true }, | |
146 | { "/etc", READONLY, false }, | |
f471b2af DH |
147 | }; |
148 | ||
149 | /* | |
150 | * ProtectSystem=strict table. In this strict mode, we mount everything | |
151 | * read-only, except for /proc, /dev, /sys which are the kernel API VFS, | |
152 | * which are left writable, but PrivateDevices= + ProtectKernelTunables= | |
153 | * protect those, and these options should be fully orthogonal. | |
154 | * (And of course /home and friends are also left writable, as ProtectHome= | |
155 | * shall manage those, orthogonally). | |
156 | */ | |
34de407a | 157 | static const MountEntry protect_system_strict_table[] = { |
ddbe0412 LP |
158 | { "/", READONLY, false }, |
159 | { "/proc", READWRITE, false }, /* ProtectKernelTunables= */ | |
160 | { "/sys", READWRITE, false }, /* ProtectKernelTunables= */ | |
161 | { "/dev", READWRITE, false }, /* PrivateDevices= */ | |
162 | { "/home", READWRITE, true }, /* ProtectHome= */ | |
163 | { "/run/user", READWRITE, true }, /* ProtectHome= */ | |
164 | { "/root", READWRITE, true }, /* ProtectHome= */ | |
f471b2af DH |
165 | }; |
166 | ||
34de407a | 167 | static const char *mount_entry_path(const MountEntry *p) { |
f0a4feb0 DH |
168 | assert(p); |
169 | ||
5327c910 LP |
170 | /* Returns the path of this bind mount. If the malloc()-allocated ->path_buffer field is set we return that, |
171 | * otherwise the stack/static ->path field is returned. */ | |
f0a4feb0 | 172 | |
5327c910 | 173 | return p->path_malloc ?: p->path_const; |
f0a4feb0 DH |
174 | } |
175 | ||
34de407a | 176 | static bool mount_entry_read_only(const MountEntry *p) { |
cfbeb4ef LP |
177 | assert(p); |
178 | ||
179 | return p->read_only || IN_SET(p->mode, READONLY, INACCESSIBLE); | |
180 | } | |
181 | ||
d2d6c096 LP |
182 | static const char *mount_entry_source(const MountEntry *p) { |
183 | assert(p); | |
184 | ||
185 | return p->source_malloc ?: p->source_const; | |
186 | } | |
187 | ||
1eb7e08e LP |
188 | static void mount_entry_done(MountEntry *p) { |
189 | assert(p); | |
190 | ||
191 | p->path_malloc = mfree(p->path_malloc); | |
192 | p->source_malloc = mfree(p->source_malloc); | |
193 | } | |
194 | ||
d18aff04 | 195 | static int append_access_mounts(MountEntry **p, char **strv, MountMode mode, bool forcibly_require_prefix) { |
15ae422b LP |
196 | char **i; |
197 | ||
613b411c LP |
198 | assert(p); |
199 | ||
5327c910 LP |
200 | /* Adds a list of user-supplied READWRITE/READONLY/INACCESSIBLE entries */ |
201 | ||
15ae422b | 202 | STRV_FOREACH(i, strv) { |
5327c910 LP |
203 | bool ignore = false, needs_prefix = false; |
204 | const char *e = *i; | |
15ae422b | 205 | |
5327c910 LP |
206 | /* Look for any prefixes */ |
207 | if (startswith(e, "-")) { | |
208 | e++; | |
9c94d52e | 209 | ignore = true; |
ea92ae33 | 210 | } |
5327c910 LP |
211 | if (startswith(e, "+")) { |
212 | e++; | |
213 | needs_prefix = true; | |
214 | } | |
ea92ae33 | 215 | |
5327c910 | 216 | if (!path_is_absolute(e)) |
15ae422b LP |
217 | return -EINVAL; |
218 | ||
34de407a | 219 | *((*p)++) = (MountEntry) { |
5327c910 LP |
220 | .path_const = e, |
221 | .mode = mode, | |
222 | .ignore = ignore, | |
d18aff04 | 223 | .has_prefix = !needs_prefix && !forcibly_require_prefix, |
5327c910 | 224 | }; |
15ae422b LP |
225 | } |
226 | ||
227 | return 0; | |
228 | } | |
229 | ||
6c47cd7d LP |
230 | static int append_empty_dir_mounts(MountEntry **p, char **strv) { |
231 | char **i; | |
232 | ||
233 | assert(p); | |
234 | ||
235 | /* Adds tmpfs mounts to provide readable but empty directories. This is primarily used to implement the | |
236 | * "/private/" boundary directories for DynamicUser=1. */ | |
237 | ||
238 | STRV_FOREACH(i, strv) { | |
239 | ||
240 | *((*p)++) = (MountEntry) { | |
241 | .path_const = *i, | |
242 | .mode = EMPTY_DIR, | |
243 | .ignore = false, | |
244 | .has_prefix = false, | |
245 | .read_only = true, | |
246 | }; | |
247 | } | |
248 | ||
249 | return 0; | |
250 | } | |
251 | ||
d2d6c096 LP |
252 | static int append_bind_mounts(MountEntry **p, const BindMount *binds, unsigned n) { |
253 | unsigned i; | |
254 | ||
255 | assert(p); | |
256 | ||
257 | for (i = 0; i < n; i++) { | |
258 | const BindMount *b = binds + i; | |
259 | ||
260 | *((*p)++) = (MountEntry) { | |
261 | .path_const = b->destination, | |
262 | .mode = b->recursive ? BIND_MOUNT_RECURSIVE : BIND_MOUNT, | |
263 | .read_only = b->read_only, | |
264 | .source_const = b->source, | |
265 | }; | |
266 | } | |
267 | ||
268 | return 0; | |
269 | } | |
270 | ||
34de407a | 271 | static int append_static_mounts(MountEntry **p, const MountEntry *mounts, unsigned n, bool ignore_protect) { |
f471b2af | 272 | unsigned i; |
11a30cec DH |
273 | |
274 | assert(p); | |
f471b2af | 275 | assert(mounts); |
11a30cec | 276 | |
5327c910 | 277 | /* Adds a list of static pre-defined entries */ |
f471b2af | 278 | |
5327c910 | 279 | for (i = 0; i < n; i++) |
34de407a LP |
280 | *((*p)++) = (MountEntry) { |
281 | .path_const = mount_entry_path(mounts+i), | |
5327c910 LP |
282 | .mode = mounts[i].mode, |
283 | .ignore = mounts[i].ignore || ignore_protect, | |
284 | }; | |
f471b2af DH |
285 | |
286 | return 0; | |
287 | } | |
288 | ||
34de407a | 289 | static int append_protect_home(MountEntry **p, ProtectHome protect_home, bool ignore_protect) { |
c575770b DH |
290 | assert(p); |
291 | ||
5327c910 | 292 | switch (protect_home) { |
b6c432ca | 293 | |
5327c910 | 294 | case PROTECT_HOME_NO: |
b6c432ca DH |
295 | return 0; |
296 | ||
b6c432ca | 297 | case PROTECT_HOME_READ_ONLY: |
5327c910 LP |
298 | return append_static_mounts(p, protect_home_read_only_table, ELEMENTSOF(protect_home_read_only_table), ignore_protect); |
299 | ||
b6c432ca | 300 | case PROTECT_HOME_YES: |
5327c910 LP |
301 | return append_static_mounts(p, protect_home_yes_table, ELEMENTSOF(protect_home_yes_table), ignore_protect); |
302 | ||
b6c432ca | 303 | default: |
5327c910 | 304 | assert_not_reached("Unexpected ProtectHome= value"); |
b6c432ca | 305 | } |
b6c432ca DH |
306 | } |
307 | ||
34de407a | 308 | static int append_protect_system(MountEntry **p, ProtectSystem protect_system, bool ignore_protect) { |
f471b2af DH |
309 | assert(p); |
310 | ||
5327c910 LP |
311 | switch (protect_system) { |
312 | ||
313 | case PROTECT_SYSTEM_NO: | |
f471b2af DH |
314 | return 0; |
315 | ||
f471b2af | 316 | case PROTECT_SYSTEM_STRICT: |
5327c910 LP |
317 | return append_static_mounts(p, protect_system_strict_table, ELEMENTSOF(protect_system_strict_table), ignore_protect); |
318 | ||
f471b2af | 319 | case PROTECT_SYSTEM_YES: |
5327c910 LP |
320 | return append_static_mounts(p, protect_system_yes_table, ELEMENTSOF(protect_system_yes_table), ignore_protect); |
321 | ||
f471b2af | 322 | case PROTECT_SYSTEM_FULL: |
5327c910 LP |
323 | return append_static_mounts(p, protect_system_full_table, ELEMENTSOF(protect_system_full_table), ignore_protect); |
324 | ||
f471b2af | 325 | default: |
5327c910 | 326 | assert_not_reached("Unexpected ProtectSystem= value"); |
f471b2af | 327 | } |
11a30cec DH |
328 | } |
329 | ||
c17ec25e | 330 | static int mount_path_compare(const void *a, const void *b) { |
34de407a | 331 | const MountEntry *p = a, *q = b; |
a0827e2b | 332 | int d; |
15ae422b | 333 | |
6ee1a919 | 334 | /* If the paths are not equal, then order prefixes first */ |
34de407a | 335 | d = path_compare(mount_entry_path(p), mount_entry_path(q)); |
6ee1a919 LP |
336 | if (d != 0) |
337 | return d; | |
15ae422b | 338 | |
6ee1a919 LP |
339 | /* If the paths are equal, check the mode */ |
340 | if (p->mode < q->mode) | |
341 | return -1; | |
15ae422b | 342 | |
6ee1a919 LP |
343 | if (p->mode > q->mode) |
344 | return 1; | |
15ae422b | 345 | |
6ee1a919 | 346 | return 0; |
15ae422b LP |
347 | } |
348 | ||
34de407a | 349 | static int prefix_where_needed(MountEntry *m, unsigned n, const char *root_directory) { |
5327c910 LP |
350 | unsigned i; |
351 | ||
352 | /* Prefixes all paths in the bind mount table with the root directory if it is specified and the entry needs | |
353 | * that. */ | |
354 | ||
355 | if (!root_directory) | |
356 | return 0; | |
357 | ||
358 | for (i = 0; i < n; i++) { | |
359 | char *s; | |
360 | ||
361 | if (m[i].has_prefix) | |
362 | continue; | |
363 | ||
34de407a | 364 | s = prefix_root(root_directory, mount_entry_path(m+i)); |
5327c910 LP |
365 | if (!s) |
366 | return -ENOMEM; | |
367 | ||
368 | free(m[i].path_malloc); | |
369 | m[i].path_malloc = s; | |
370 | ||
371 | m[i].has_prefix = true; | |
372 | } | |
373 | ||
374 | return 0; | |
375 | } | |
376 | ||
34de407a LP |
377 | static void drop_duplicates(MountEntry *m, unsigned *n) { |
378 | MountEntry *f, *t, *previous; | |
15ae422b | 379 | |
c17ec25e | 380 | assert(m); |
15ae422b | 381 | assert(n); |
15ae422b | 382 | |
fe3c2583 LP |
383 | /* Drops duplicate entries. Expects that the array is properly ordered already. */ |
384 | ||
1d54cd5d | 385 | for (f = m, t = m, previous = NULL; f < m + *n; f++) { |
15ae422b | 386 | |
fe3c2583 LP |
387 | /* The first one wins (which is the one with the more restrictive mode), see mount_path_compare() |
388 | * above. */ | |
34de407a LP |
389 | if (previous && path_equal(mount_entry_path(f), mount_entry_path(previous))) { |
390 | log_debug("%s is duplicate.", mount_entry_path(f)); | |
391 | previous->read_only = previous->read_only || mount_entry_read_only(f); /* Propagate the read-only flag to the remaining entry */ | |
1eb7e08e | 392 | mount_entry_done(f); |
15ae422b | 393 | continue; |
fe3c2583 | 394 | } |
15ae422b | 395 | |
e2d7c1a0 | 396 | *t = *f; |
15ae422b | 397 | previous = t; |
fe3c2583 LP |
398 | t++; |
399 | } | |
400 | ||
401 | *n = t - m; | |
402 | } | |
403 | ||
34de407a LP |
404 | static void drop_inaccessible(MountEntry *m, unsigned *n) { |
405 | MountEntry *f, *t; | |
fe3c2583 LP |
406 | const char *clear = NULL; |
407 | ||
408 | assert(m); | |
409 | assert(n); | |
410 | ||
411 | /* Drops all entries obstructed by another entry further up the tree. Expects that the array is properly | |
412 | * ordered already. */ | |
413 | ||
1d54cd5d | 414 | for (f = m, t = m; f < m + *n; f++) { |
fe3c2583 LP |
415 | |
416 | /* If we found a path set for INACCESSIBLE earlier, and this entry has it as prefix we should drop | |
417 | * it, as inaccessible paths really should drop the entire subtree. */ | |
34de407a LP |
418 | if (clear && path_startswith(mount_entry_path(f), clear)) { |
419 | log_debug("%s is masked by %s.", mount_entry_path(f), clear); | |
1eb7e08e | 420 | mount_entry_done(f); |
fe3c2583 LP |
421 | continue; |
422 | } | |
15ae422b | 423 | |
34de407a | 424 | clear = f->mode == INACCESSIBLE ? mount_entry_path(f) : NULL; |
fe3c2583 LP |
425 | |
426 | *t = *f; | |
15ae422b LP |
427 | t++; |
428 | } | |
429 | ||
c17ec25e | 430 | *n = t - m; |
15ae422b LP |
431 | } |
432 | ||
34de407a LP |
433 | static void drop_nop(MountEntry *m, unsigned *n) { |
434 | MountEntry *f, *t; | |
7648a565 LP |
435 | |
436 | assert(m); | |
437 | assert(n); | |
438 | ||
439 | /* Drops all entries which have an immediate parent that has the same type, as they are redundant. Assumes the | |
440 | * list is ordered by prefixes. */ | |
441 | ||
1d54cd5d | 442 | for (f = m, t = m; f < m + *n; f++) { |
7648a565 LP |
443 | |
444 | /* Only suppress such subtrees for READONLY and READWRITE entries */ | |
445 | if (IN_SET(f->mode, READONLY, READWRITE)) { | |
34de407a | 446 | MountEntry *p; |
7648a565 LP |
447 | bool found = false; |
448 | ||
449 | /* Now let's find the first parent of the entry we are looking at. */ | |
450 | for (p = t-1; p >= m; p--) { | |
34de407a | 451 | if (path_startswith(mount_entry_path(f), mount_entry_path(p))) { |
7648a565 LP |
452 | found = true; |
453 | break; | |
454 | } | |
455 | } | |
456 | ||
457 | /* We found it, let's see if it's the same mode, if so, we can drop this entry */ | |
458 | if (found && p->mode == f->mode) { | |
34de407a | 459 | log_debug("%s is redundant by %s", mount_entry_path(f), mount_entry_path(p)); |
1eb7e08e | 460 | mount_entry_done(f); |
7648a565 LP |
461 | continue; |
462 | } | |
463 | } | |
464 | ||
465 | *t = *f; | |
466 | t++; | |
467 | } | |
468 | ||
469 | *n = t - m; | |
470 | } | |
471 | ||
34de407a LP |
472 | static void drop_outside_root(const char *root_directory, MountEntry *m, unsigned *n) { |
473 | MountEntry *f, *t; | |
cd2902c9 LP |
474 | |
475 | assert(m); | |
476 | assert(n); | |
477 | ||
1d54cd5d | 478 | /* Nothing to do */ |
cd2902c9 LP |
479 | if (!root_directory) |
480 | return; | |
481 | ||
482 | /* Drops all mounts that are outside of the root directory. */ | |
483 | ||
1d54cd5d | 484 | for (f = m, t = m; f < m + *n; f++) { |
cd2902c9 | 485 | |
34de407a LP |
486 | if (!path_startswith(mount_entry_path(f), root_directory)) { |
487 | log_debug("%s is outside of root directory.", mount_entry_path(f)); | |
1eb7e08e | 488 | mount_entry_done(f); |
cd2902c9 LP |
489 | continue; |
490 | } | |
491 | ||
492 | *t = *f; | |
493 | t++; | |
494 | } | |
495 | ||
496 | *n = t - m; | |
497 | } | |
498 | ||
414b304b | 499 | static int clone_device_node(const char *d, const char *temporary_mount) { |
b5e99f23 ДГ |
500 | _cleanup_free_ char *dn = NULL; |
501 | struct stat st; | |
502 | int r; | |
503 | ||
414b304b | 504 | if (stat(d, &st) < 0) { |
b5e99f23 ДГ |
505 | if (errno == ENOENT) |
506 | return 0; | |
507 | return -errno; | |
508 | } | |
509 | ||
510 | if (!S_ISBLK(st.st_mode) && | |
511 | !S_ISCHR(st.st_mode)) | |
512 | return -EINVAL; | |
513 | ||
514 | if (st.st_rdev == 0) | |
515 | return 0; | |
516 | ||
517 | dn = strappend(temporary_mount, d); | |
518 | if (!dn) | |
519 | return -ENOMEM; | |
520 | ||
521 | mac_selinux_create_file_prepare(d, st.st_mode); | |
522 | r = mknod(dn, st.st_mode, st.st_rdev); | |
523 | mac_selinux_create_file_clear(); | |
524 | ||
525 | if (r < 0) | |
526 | return -errno; | |
527 | ||
528 | return 0; | |
529 | } | |
530 | ||
5d997827 | 531 | static int mount_private_dev(MountEntry *m) { |
7f112f50 LP |
532 | static const char devnodes[] = |
533 | "/dev/null\0" | |
534 | "/dev/zero\0" | |
535 | "/dev/full\0" | |
536 | "/dev/random\0" | |
537 | "/dev/urandom\0" | |
538 | "/dev/tty\0"; | |
539 | ||
2b85f4e1 | 540 | char temporary_mount[] = "/tmp/namespace-dev-XXXXXX"; |
63cc4c31 | 541 | const char *d, *dev = NULL, *devpts = NULL, *devshm = NULL, *devhugepages = NULL, *devmqueue = NULL, *devlog = NULL, *devptmx = NULL; |
7f112f50 | 542 | _cleanup_umask_ mode_t u; |
414b304b | 543 | struct stat st; |
7f112f50 LP |
544 | int r; |
545 | ||
546 | assert(m); | |
547 | ||
548 | u = umask(0000); | |
549 | ||
2b85f4e1 LP |
550 | if (!mkdtemp(temporary_mount)) |
551 | return -errno; | |
552 | ||
63c372cb | 553 | dev = strjoina(temporary_mount, "/dev"); |
dc751688 | 554 | (void) mkdir(dev, 0755); |
737ba3c8 | 555 | if (mount("tmpfs", dev, "tmpfs", DEV_MOUNT_OPTIONS, "mode=755") < 0) { |
2b85f4e1 LP |
556 | r = -errno; |
557 | goto fail; | |
558 | } | |
559 | ||
63c372cb | 560 | devpts = strjoina(temporary_mount, "/dev/pts"); |
dc751688 | 561 | (void) mkdir(devpts, 0755); |
2b85f4e1 LP |
562 | if (mount("/dev/pts", devpts, NULL, MS_BIND, NULL) < 0) { |
563 | r = -errno; | |
564 | goto fail; | |
565 | } | |
566 | ||
414b304b ДГ |
567 | /* /dev/ptmx can either be a device node or a symlink to /dev/pts/ptmx |
568 | * when /dev/ptmx a device node, /dev/pts/ptmx has 000 permissions making it inaccessible | |
569 | * thus, in that case make a clone | |
570 | * | |
571 | * in nspawn and other containers it will be a symlink, in that case make it a symlink | |
572 | */ | |
573 | if (lstat("/dev/ptmx", &st) < 0) { | |
3164e3cb ZJS |
574 | r = -errno; |
575 | goto fail; | |
576 | } | |
414b304b ДГ |
577 | if (S_ISLNK(st.st_mode)) { |
578 | devptmx = strjoina(temporary_mount, "/dev/ptmx"); | |
579 | if (symlink("pts/ptmx", devptmx) < 0) { | |
580 | r = -errno; | |
581 | goto fail; | |
582 | } | |
583 | } else { | |
584 | r = clone_device_node("/dev/ptmx", temporary_mount); | |
585 | if (r < 0) | |
586 | goto fail; | |
587 | } | |
e06b6479 | 588 | |
63c372cb | 589 | devshm = strjoina(temporary_mount, "/dev/shm"); |
dc751688 | 590 | (void) mkdir(devshm, 01777); |
2b85f4e1 LP |
591 | r = mount("/dev/shm", devshm, NULL, MS_BIND, NULL); |
592 | if (r < 0) { | |
593 | r = -errno; | |
594 | goto fail; | |
595 | } | |
596 | ||
63c372cb | 597 | devmqueue = strjoina(temporary_mount, "/dev/mqueue"); |
dc751688 | 598 | (void) mkdir(devmqueue, 0755); |
3164e3cb | 599 | (void) mount("/dev/mqueue", devmqueue, NULL, MS_BIND, NULL); |
2b85f4e1 | 600 | |
63c372cb | 601 | devhugepages = strjoina(temporary_mount, "/dev/hugepages"); |
dc751688 | 602 | (void) mkdir(devhugepages, 0755); |
3164e3cb | 603 | (void) mount("/dev/hugepages", devhugepages, NULL, MS_BIND, NULL); |
2b85f4e1 | 604 | |
63c372cb | 605 | devlog = strjoina(temporary_mount, "/dev/log"); |
3164e3cb | 606 | (void) symlink("/run/systemd/journal/dev-log", devlog); |
82d25240 | 607 | |
7f112f50 | 608 | NULSTR_FOREACH(d, devnodes) { |
b5e99f23 ДГ |
609 | r = clone_device_node(d, temporary_mount); |
610 | if (r < 0) | |
2b85f4e1 | 611 | goto fail; |
7f112f50 LP |
612 | } |
613 | ||
03cfe0d5 | 614 | dev_setup(temporary_mount, UID_INVALID, GID_INVALID); |
7f112f50 | 615 | |
ee818b89 AC |
616 | /* Create the /dev directory if missing. It is more likely to be |
617 | * missing when the service is started with RootDirectory. This is | |
618 | * consistent with mount units creating the mount points when missing. | |
619 | */ | |
34de407a | 620 | (void) mkdir_p_label(mount_entry_path(m), 0755); |
ee818b89 | 621 | |
9e5f8252 | 622 | /* Unmount everything in old /dev */ |
34de407a LP |
623 | umount_recursive(mount_entry_path(m), 0); |
624 | if (mount(dev, mount_entry_path(m), NULL, MS_MOVE, NULL) < 0) { | |
2b85f4e1 LP |
625 | r = -errno; |
626 | goto fail; | |
627 | } | |
7f112f50 | 628 | |
2b85f4e1 LP |
629 | rmdir(dev); |
630 | rmdir(temporary_mount); | |
7f112f50 | 631 | |
2b85f4e1 | 632 | return 0; |
7f112f50 | 633 | |
2b85f4e1 LP |
634 | fail: |
635 | if (devpts) | |
636 | umount(devpts); | |
7f112f50 | 637 | |
2b85f4e1 LP |
638 | if (devshm) |
639 | umount(devshm); | |
7f112f50 | 640 | |
2b85f4e1 LP |
641 | if (devhugepages) |
642 | umount(devhugepages); | |
7f112f50 | 643 | |
2b85f4e1 LP |
644 | if (devmqueue) |
645 | umount(devmqueue); | |
7f112f50 | 646 | |
d267c5aa ZJS |
647 | umount(dev); |
648 | rmdir(dev); | |
2b85f4e1 | 649 | rmdir(temporary_mount); |
7f112f50 | 650 | |
2b85f4e1 | 651 | return r; |
7f112f50 LP |
652 | } |
653 | ||
5d997827 LP |
654 | static int mount_bind_dev(MountEntry *m) { |
655 | int r; | |
656 | ||
657 | assert(m); | |
658 | ||
659 | /* Implements the little brother of mount_private_dev(): simply bind mounts the host's /dev into the service's | |
660 | * /dev. This is only used when RootDirectory= is set. */ | |
661 | ||
645767d6 LP |
662 | (void) mkdir_p_label(mount_entry_path(m), 0755); |
663 | ||
5d997827 LP |
664 | r = path_is_mount_point(mount_entry_path(m), NULL, 0); |
665 | if (r < 0) | |
666 | return log_debug_errno(r, "Unable to determine whether /dev is already mounted: %m"); | |
667 | if (r > 0) /* make this a NOP if /dev is already a mount point */ | |
668 | return 0; | |
669 | ||
670 | if (mount("/dev", mount_entry_path(m), NULL, MS_BIND|MS_REC, NULL) < 0) | |
671 | return log_debug_errno(errno, "Failed to bind mount %s: %m", mount_entry_path(m)); | |
672 | ||
673 | return 1; | |
674 | } | |
675 | ||
676 | static int mount_sysfs(MountEntry *m) { | |
677 | int r; | |
678 | ||
679 | assert(m); | |
680 | ||
645767d6 LP |
681 | (void) mkdir_p_label(mount_entry_path(m), 0755); |
682 | ||
5d997827 LP |
683 | r = path_is_mount_point(mount_entry_path(m), NULL, 0); |
684 | if (r < 0) | |
685 | return log_debug_errno(r, "Unable to determine whether /sys is already mounted: %m"); | |
686 | if (r > 0) /* make this a NOP if /sys is already a mount point */ | |
687 | return 0; | |
688 | ||
689 | /* Bind mount the host's version so that we get all child mounts of it, too. */ | |
690 | if (mount("/sys", mount_entry_path(m), NULL, MS_BIND|MS_REC, NULL) < 0) | |
691 | return log_debug_errno(errno, "Failed to mount %s: %m", mount_entry_path(m)); | |
692 | ||
693 | return 1; | |
694 | } | |
695 | ||
696 | static int mount_procfs(MountEntry *m) { | |
697 | int r; | |
698 | ||
699 | assert(m); | |
700 | ||
645767d6 LP |
701 | (void) mkdir_p_label(mount_entry_path(m), 0755); |
702 | ||
5d997827 LP |
703 | r = path_is_mount_point(mount_entry_path(m), NULL, 0); |
704 | if (r < 0) | |
705 | return log_debug_errno(r, "Unable to determine whether /proc is already mounted: %m"); | |
706 | if (r > 0) /* make this a NOP if /proc is already a mount point */ | |
707 | return 0; | |
708 | ||
709 | /* Mount a new instance, so that we get the one that matches our user namespace, if we are running in one */ | |
710 | if (mount("proc", mount_entry_path(m), "proc", MS_NOSUID|MS_NOEXEC|MS_NODEV, NULL) < 0) | |
711 | return log_debug_errno(errno, "Failed to mount %s: %m", mount_entry_path(m)); | |
712 | ||
713 | return 1; | |
714 | } | |
715 | ||
6c47cd7d LP |
716 | static int mount_empty_dir(MountEntry *m) { |
717 | assert(m); | |
718 | ||
719 | /* First, get rid of everything that is below if there is anything. Then, overmount with our new empty dir */ | |
720 | ||
721 | (void) mkdir_p_label(mount_entry_path(m), 0755); | |
722 | (void) umount_recursive(mount_entry_path(m), 0); | |
723 | ||
724 | if (mount("tmpfs", mount_entry_path(m), "tmpfs", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME, "mode=755") < 0) | |
725 | return log_debug_errno(errno, "Failed to mount %s: %m", mount_entry_path(m)); | |
726 | ||
727 | return 1; | |
728 | } | |
729 | ||
d2d6c096 LP |
730 | static int mount_entry_chase( |
731 | const char *root_directory, | |
732 | MountEntry *m, | |
733 | const char *path, | |
734 | char **location) { | |
735 | ||
8fceda93 LP |
736 | char *chased; |
737 | int r; | |
738 | ||
739 | assert(m); | |
740 | ||
741 | /* Since mount() will always follow symlinks and we need to take the different root directory into account we | |
d2d6c096 LP |
742 | * chase the symlinks on our own first. This is called for the destination path, as well as the source path (if |
743 | * that applies). The result is stored in "location". */ | |
8fceda93 | 744 | |
a227a4be LP |
745 | r = chase_symlinks(path, root_directory, |
746 | IN_SET(m->mode, BIND_MOUNT, BIND_MOUNT_RECURSIVE, PRIVATE_TMP, PRIVATE_VAR_TMP, PRIVATE_DEV, BIND_DEV, EMPTY_DIR, SYSFS, PROCFS) ? CHASE_NONEXISTENT : 0, | |
747 | &chased); | |
8fceda93 | 748 | if (r == -ENOENT && m->ignore) { |
d2d6c096 | 749 | log_debug_errno(r, "Path %s does not exist, ignoring.", path); |
8fceda93 LP |
750 | return 0; |
751 | } | |
752 | if (r < 0) | |
d2d6c096 | 753 | return log_debug_errno(r, "Failed to follow symlinks on %s: %m", path); |
8fceda93 | 754 | |
d2d6c096 | 755 | log_debug("Followed symlinks %s → %s.", path, chased); |
8fceda93 | 756 | |
d2d6c096 LP |
757 | free(*location); |
758 | *location = chased; | |
8fceda93 LP |
759 | |
760 | return 1; | |
761 | } | |
762 | ||
ac0930c8 | 763 | static int apply_mount( |
8fceda93 | 764 | const char *root_directory, |
34de407a | 765 | MountEntry *m, |
ac0930c8 | 766 | const char *tmp_dir, |
c17ec25e | 767 | const char *var_tmp_dir) { |
ac0930c8 | 768 | |
a227a4be | 769 | bool rbind = true, make = false; |
15ae422b | 770 | const char *what; |
15ae422b | 771 | int r; |
15ae422b | 772 | |
c17ec25e | 773 | assert(m); |
15ae422b | 774 | |
d2d6c096 | 775 | r = mount_entry_chase(root_directory, m, mount_entry_path(m), &m->path_malloc); |
8fceda93 LP |
776 | if (r <= 0) |
777 | return r; | |
778 | ||
34de407a | 779 | log_debug("Applying namespace mount on %s", mount_entry_path(m)); |
fe3c2583 | 780 | |
c17ec25e | 781 | switch (m->mode) { |
15ae422b | 782 | |
160cfdbe LP |
783 | case INACCESSIBLE: { |
784 | struct stat target; | |
6d313367 LP |
785 | |
786 | /* First, get rid of everything that is below if there | |
787 | * is anything... Then, overmount it with an | |
c4b41707 | 788 | * inaccessible path. */ |
34de407a | 789 | (void) umount_recursive(mount_entry_path(m), 0); |
6d313367 | 790 | |
34de407a LP |
791 | if (lstat(mount_entry_path(m), &target) < 0) |
792 | return log_debug_errno(errno, "Failed to lstat() %s to determine what to mount over it: %m", mount_entry_path(m)); | |
15ae422b | 793 | |
c4b41707 | 794 | what = mode_to_inaccessible_node(target.st_mode); |
5fd7cf6f LP |
795 | if (!what) { |
796 | log_debug("File type not supported for inaccessible mounts. Note that symlinks are not allowed"); | |
c4b41707 AP |
797 | return -ELOOP; |
798 | } | |
799 | break; | |
160cfdbe | 800 | } |
fe3c2583 | 801 | |
15ae422b | 802 | case READONLY: |
15ae422b | 803 | case READWRITE: |
8fceda93 | 804 | r = path_is_mount_point(mount_entry_path(m), root_directory, 0); |
d944dc95 | 805 | if (r < 0) |
34de407a | 806 | return log_debug_errno(r, "Failed to determine whether %s is already a mount point: %m", mount_entry_path(m)); |
6b7c9f8b LP |
807 | if (r > 0) /* Nothing to do here, it is already a mount. We just later toggle the MS_RDONLY bit for the mount point if needed. */ |
808 | return 0; | |
6b7c9f8b | 809 | /* This isn't a mount point yet, let's make it one. */ |
34de407a | 810 | what = mount_entry_path(m); |
6b7c9f8b | 811 | break; |
15ae422b | 812 | |
d2d6c096 LP |
813 | case BIND_MOUNT: |
814 | rbind = false; | |
d2d6c096 | 815 | |
4831981d | 816 | _fallthrough_; |
d2d6c096 LP |
817 | case BIND_MOUNT_RECURSIVE: |
818 | /* Also chase the source mount */ | |
5d997827 | 819 | |
d2d6c096 LP |
820 | r = mount_entry_chase(root_directory, m, mount_entry_source(m), &m->source_malloc); |
821 | if (r <= 0) | |
822 | return r; | |
823 | ||
824 | what = mount_entry_source(m); | |
a227a4be | 825 | make = true; |
d2d6c096 LP |
826 | break; |
827 | ||
6c47cd7d LP |
828 | case EMPTY_DIR: |
829 | return mount_empty_dir(m); | |
830 | ||
ac0930c8 LP |
831 | case PRIVATE_TMP: |
832 | what = tmp_dir; | |
a227a4be | 833 | make = true; |
ac0930c8 LP |
834 | break; |
835 | ||
836 | case PRIVATE_VAR_TMP: | |
837 | what = var_tmp_dir; | |
a227a4be | 838 | make = true; |
15ae422b | 839 | break; |
e364ad06 | 840 | |
d6797c92 | 841 | case PRIVATE_DEV: |
5d997827 LP |
842 | return mount_private_dev(m); |
843 | ||
844 | case BIND_DEV: | |
845 | return mount_bind_dev(m); | |
846 | ||
847 | case SYSFS: | |
848 | return mount_sysfs(m); | |
849 | ||
850 | case PROCFS: | |
851 | return mount_procfs(m); | |
d6797c92 | 852 | |
e364ad06 LP |
853 | default: |
854 | assert_not_reached("Unknown mode"); | |
15ae422b LP |
855 | } |
856 | ||
ac0930c8 | 857 | assert(what); |
15ae422b | 858 | |
a227a4be LP |
859 | if (mount(what, mount_entry_path(m), NULL, MS_BIND|(rbind ? MS_REC : 0), NULL) < 0) { |
860 | bool try_again = false; | |
861 | r = -errno; | |
862 | ||
863 | if (r == -ENOENT && make) { | |
864 | struct stat st; | |
865 | ||
866 | /* Hmm, either the source or the destination are missing. Let's see if we can create the destination, then try again */ | |
867 | ||
868 | if (stat(what, &st) >= 0) { | |
869 | ||
870 | (void) mkdir_parents(mount_entry_path(m), 0755); | |
871 | ||
872 | if (S_ISDIR(st.st_mode)) | |
873 | try_again = mkdir(mount_entry_path(m), 0755) >= 0; | |
874 | else | |
875 | try_again = touch(mount_entry_path(m)) >= 0; | |
876 | } | |
877 | } | |
878 | ||
879 | if (try_again) { | |
880 | if (mount(what, mount_entry_path(m), NULL, MS_BIND|(rbind ? MS_REC : 0), NULL) < 0) | |
881 | r = -errno; | |
882 | else | |
883 | r = 0; | |
884 | } | |
885 | ||
886 | if (r < 0) | |
887 | return log_debug_errno(r, "Failed to mount %s to %s: %m", what, mount_entry_path(m)); | |
888 | } | |
6b7c9f8b | 889 | |
34de407a | 890 | log_debug("Successfully mounted %s to %s", what, mount_entry_path(m)); |
6b7c9f8b | 891 | return 0; |
ac0930c8 | 892 | } |
15ae422b | 893 | |
ac9de0b3 | 894 | static int make_read_only(MountEntry *m, char **blacklist, FILE *proc_self_mountinfo) { |
6b7c9f8b | 895 | int r = 0; |
15ae422b | 896 | |
c17ec25e | 897 | assert(m); |
ac9de0b3 | 898 | assert(proc_self_mountinfo); |
ac0930c8 | 899 | |
34de407a | 900 | if (mount_entry_read_only(m)) |
ac9de0b3 | 901 | r = bind_remount_recursive_with_mountinfo(mount_entry_path(m), true, blacklist, proc_self_mountinfo); |
13e785f7 | 902 | else if (m->mode == PRIVATE_DEV) { /* Superblock can be readonly but the submounts can't */ |
34de407a | 903 | if (mount(NULL, mount_entry_path(m), NULL, MS_REMOUNT|DEV_MOUNT_OPTIONS|MS_RDONLY, NULL) < 0) |
6b7c9f8b | 904 | r = -errno; |
737ba3c8 | 905 | } else |
6b7c9f8b LP |
906 | return 0; |
907 | ||
908 | /* Not that we only turn on the MS_RDONLY flag here, we never turn it off. Something that was marked read-only | |
909 | * already stays this way. This improves compatibility with container managers, where we won't attempt to undo | |
910 | * read-only mounts already applied. */ | |
ac0930c8 | 911 | |
8fceda93 LP |
912 | if (r == -ENOENT && m->ignore) |
913 | r = 0; | |
5327c910 | 914 | |
1d54cd5d | 915 | return r; |
d944dc95 LP |
916 | } |
917 | ||
bb0ff3fb | 918 | static bool namespace_info_mount_apivfs(const char *root_directory, const NamespaceInfo *ns_info) { |
5d997827 LP |
919 | assert(ns_info); |
920 | ||
9c988f93 DH |
921 | /* |
922 | * ProtectControlGroups= and ProtectKernelTunables= imply MountAPIVFS=, | |
923 | * since to protect the API VFS mounts, they need to be around in the | |
924 | * first place... and RootDirectory= or RootImage= need to be set. | |
925 | */ | |
5d997827 | 926 | |
9c988f93 DH |
927 | /* root_directory should point to a mount point */ |
928 | return root_directory && | |
929 | (ns_info->mount_apivfs || | |
930 | ns_info->protect_control_groups || | |
931 | ns_info->protect_kernel_tunables); | |
5d997827 LP |
932 | } |
933 | ||
2652c6c1 | 934 | static unsigned namespace_calculate_mounts( |
9c988f93 | 935 | const char* root_directory, |
bb0ff3fb | 936 | const NamespaceInfo *ns_info, |
2652c6c1 DH |
937 | char** read_write_paths, |
938 | char** read_only_paths, | |
939 | char** inaccessible_paths, | |
6c47cd7d | 940 | char** empty_directories, |
d2d6c096 LP |
941 | const BindMount *bind_mounts, |
942 | unsigned n_bind_mounts, | |
2652c6c1 DH |
943 | const char* tmp_dir, |
944 | const char* var_tmp_dir, | |
2652c6c1 DH |
945 | ProtectHome protect_home, |
946 | ProtectSystem protect_system) { | |
947 | ||
b6c432ca | 948 | unsigned protect_home_cnt; |
f471b2af DH |
949 | unsigned protect_system_cnt = |
950 | (protect_system == PROTECT_SYSTEM_STRICT ? | |
951 | ELEMENTSOF(protect_system_strict_table) : | |
952 | ((protect_system == PROTECT_SYSTEM_FULL) ? | |
953 | ELEMENTSOF(protect_system_full_table) : | |
954 | ((protect_system == PROTECT_SYSTEM_YES) ? | |
955 | ELEMENTSOF(protect_system_yes_table) : 0))); | |
956 | ||
b6c432ca DH |
957 | protect_home_cnt = |
958 | (protect_home == PROTECT_HOME_YES ? | |
959 | ELEMENTSOF(protect_home_yes_table) : | |
960 | ((protect_home == PROTECT_HOME_READ_ONLY) ? | |
961 | ELEMENTSOF(protect_home_read_only_table) : 0)); | |
962 | ||
2652c6c1 DH |
963 | return !!tmp_dir + !!var_tmp_dir + |
964 | strv_length(read_write_paths) + | |
965 | strv_length(read_only_paths) + | |
966 | strv_length(inaccessible_paths) + | |
6c47cd7d | 967 | strv_length(empty_directories) + |
d2d6c096 | 968 | n_bind_mounts + |
c575770b DH |
969 | ns_info->private_dev + |
970 | (ns_info->protect_kernel_tunables ? ELEMENTSOF(protect_kernel_tunables_table) : 0) + | |
971 | (ns_info->protect_control_groups ? 1 : 0) + | |
972 | (ns_info->protect_kernel_modules ? ELEMENTSOF(protect_kernel_modules_table) : 0) + | |
5d997827 | 973 | protect_home_cnt + protect_system_cnt + |
9c988f93 | 974 | (namespace_info_mount_apivfs(root_directory, ns_info) ? ELEMENTSOF(apivfs_table) : 0); |
2652c6c1 DH |
975 | } |
976 | ||
613b411c | 977 | int setup_namespace( |
ee818b89 | 978 | const char* root_directory, |
915e6d16 | 979 | const char* root_image, |
bb0ff3fb | 980 | const NamespaceInfo *ns_info, |
2a624c36 AP |
981 | char** read_write_paths, |
982 | char** read_only_paths, | |
983 | char** inaccessible_paths, | |
6c47cd7d | 984 | char** empty_directories, |
d2d6c096 LP |
985 | const BindMount *bind_mounts, |
986 | unsigned n_bind_mounts, | |
a004cb4c LP |
987 | const char* tmp_dir, |
988 | const char* var_tmp_dir, | |
1b8689f9 LP |
989 | ProtectHome protect_home, |
990 | ProtectSystem protect_system, | |
915e6d16 LP |
991 | unsigned long mount_flags, |
992 | DissectImageFlags dissect_image_flags) { | |
15ae422b | 993 | |
915e6d16 | 994 | _cleanup_(loop_device_unrefp) LoopDevice *loop_device = NULL; |
78ebe980 | 995 | _cleanup_(decrypted_image_unrefp) DecryptedImage *decrypted_image = NULL; |
915e6d16 | 996 | _cleanup_(dissected_image_unrefp) DissectedImage *dissected_image = NULL; |
78ebe980 | 997 | _cleanup_free_ void *root_hash = NULL; |
34de407a | 998 | MountEntry *m, *mounts = NULL; |
78ebe980 | 999 | size_t root_hash_size = 0; |
d944dc95 | 1000 | bool make_slave = false; |
e908468b | 1001 | const char *root; |
f0a4feb0 | 1002 | unsigned n_mounts; |
d18aff04 | 1003 | bool require_prefix = false; |
c17ec25e | 1004 | int r = 0; |
15ae422b | 1005 | |
915e6d16 LP |
1006 | assert(ns_info); |
1007 | ||
613b411c | 1008 | if (mount_flags == 0) |
c17ec25e | 1009 | mount_flags = MS_SHARED; |
ac0930c8 | 1010 | |
915e6d16 LP |
1011 | if (root_image) { |
1012 | dissect_image_flags |= DISSECT_IMAGE_REQUIRE_ROOT; | |
1013 | ||
1014 | if (protect_system == PROTECT_SYSTEM_STRICT && strv_isempty(read_write_paths)) | |
1015 | dissect_image_flags |= DISSECT_IMAGE_READ_ONLY; | |
1016 | ||
1017 | r = loop_device_make_by_path(root_image, | |
1018 | dissect_image_flags & DISSECT_IMAGE_READ_ONLY ? O_RDONLY : O_RDWR, | |
1019 | &loop_device); | |
1020 | if (r < 0) | |
1021 | return r; | |
1022 | ||
78ebe980 LP |
1023 | r = root_hash_load(root_image, &root_hash, &root_hash_size); |
1024 | if (r < 0) | |
1025 | return r; | |
1026 | ||
1027 | r = dissect_image(loop_device->fd, root_hash, root_hash_size, dissect_image_flags, &dissected_image); | |
1028 | if (r < 0) | |
1029 | return r; | |
1030 | ||
1031 | r = dissected_image_decrypt(dissected_image, NULL, root_hash, root_hash_size, dissect_image_flags, &decrypted_image); | |
915e6d16 LP |
1032 | if (r < 0) |
1033 | return r; | |
915e6d16 LP |
1034 | } |
1035 | ||
e908468b LP |
1036 | if (root_directory) |
1037 | root = root_directory; | |
1038 | else if (root_image || n_bind_mounts > 0) { | |
1039 | ||
1040 | /* If we are booting from an image, create a mount point for the image, if it's still missing. We use | |
1041 | * the same mount point for all images, which is safe, since they all live in their own namespaces | |
1042 | * after all, and hence won't see each other. We also use such a root directory whenever there are bind | |
1043 | * mounts configured, so that their source mounts are never obstructed by mounts we already applied | |
1044 | * while we are applying them. */ | |
1045 | ||
1046 | root = "/run/systemd/unit-root"; | |
1047 | (void) mkdir_label(root, 0700); | |
d18aff04 | 1048 | require_prefix = true; |
e908468b LP |
1049 | } else |
1050 | root = NULL; | |
1051 | ||
cfbeb4ef | 1052 | n_mounts = namespace_calculate_mounts( |
e908468b | 1053 | root, |
cfbeb4ef LP |
1054 | ns_info, |
1055 | read_write_paths, | |
1056 | read_only_paths, | |
1057 | inaccessible_paths, | |
6c47cd7d | 1058 | empty_directories, |
d2d6c096 | 1059 | bind_mounts, n_bind_mounts, |
cfbeb4ef LP |
1060 | tmp_dir, var_tmp_dir, |
1061 | protect_home, protect_system); | |
613b411c | 1062 | |
2652c6c1 | 1063 | /* Set mount slave mode */ |
e908468b | 1064 | if (root || n_mounts > 0) |
d944dc95 LP |
1065 | make_slave = true; |
1066 | ||
f0a4feb0 | 1067 | if (n_mounts > 0) { |
34de407a | 1068 | m = mounts = (MountEntry *) alloca0(n_mounts * sizeof(MountEntry)); |
d18aff04 | 1069 | r = append_access_mounts(&m, read_write_paths, READWRITE, require_prefix); |
613b411c | 1070 | if (r < 0) |
f0a4feb0 | 1071 | goto finish; |
613b411c | 1072 | |
d18aff04 | 1073 | r = append_access_mounts(&m, read_only_paths, READONLY, require_prefix); |
613b411c | 1074 | if (r < 0) |
f0a4feb0 | 1075 | goto finish; |
613b411c | 1076 | |
d18aff04 | 1077 | r = append_access_mounts(&m, inaccessible_paths, INACCESSIBLE, require_prefix); |
613b411c | 1078 | if (r < 0) |
f0a4feb0 | 1079 | goto finish; |
7ff7394d | 1080 | |
6c47cd7d LP |
1081 | r = append_empty_dir_mounts(&m, empty_directories); |
1082 | if (r < 0) | |
1083 | goto finish; | |
1084 | ||
d2d6c096 LP |
1085 | r = append_bind_mounts(&m, bind_mounts, n_bind_mounts); |
1086 | if (r < 0) | |
1087 | goto finish; | |
1088 | ||
613b411c | 1089 | if (tmp_dir) { |
34de407a | 1090 | *(m++) = (MountEntry) { |
5327c910 LP |
1091 | .path_const = "/tmp", |
1092 | .mode = PRIVATE_TMP, | |
1093 | }; | |
613b411c | 1094 | } |
7ff7394d | 1095 | |
613b411c | 1096 | if (var_tmp_dir) { |
34de407a | 1097 | *(m++) = (MountEntry) { |
5327c910 LP |
1098 | .path_const = "/var/tmp", |
1099 | .mode = PRIVATE_VAR_TMP, | |
1100 | }; | |
7ff7394d | 1101 | } |
ac0930c8 | 1102 | |
c575770b | 1103 | if (ns_info->private_dev) { |
34de407a | 1104 | *(m++) = (MountEntry) { |
5327c910 LP |
1105 | .path_const = "/dev", |
1106 | .mode = PRIVATE_DEV, | |
1107 | }; | |
7f112f50 LP |
1108 | } |
1109 | ||
c575770b | 1110 | if (ns_info->protect_kernel_tunables) { |
5327c910 | 1111 | r = append_static_mounts(&m, protect_kernel_tunables_table, ELEMENTSOF(protect_kernel_tunables_table), ns_info->ignore_protect_paths); |
c575770b | 1112 | if (r < 0) |
f0a4feb0 | 1113 | goto finish; |
c575770b DH |
1114 | } |
1115 | ||
1116 | if (ns_info->protect_kernel_modules) { | |
5327c910 | 1117 | r = append_static_mounts(&m, protect_kernel_modules_table, ELEMENTSOF(protect_kernel_modules_table), ns_info->ignore_protect_paths); |
c575770b | 1118 | if (r < 0) |
f0a4feb0 | 1119 | goto finish; |
c575770b | 1120 | } |
59eeb84b | 1121 | |
c575770b | 1122 | if (ns_info->protect_control_groups) { |
34de407a | 1123 | *(m++) = (MountEntry) { |
5327c910 LP |
1124 | .path_const = "/sys/fs/cgroup", |
1125 | .mode = READONLY, | |
1126 | }; | |
59eeb84b LP |
1127 | } |
1128 | ||
5327c910 | 1129 | r = append_protect_home(&m, protect_home, ns_info->ignore_protect_paths); |
b6c432ca | 1130 | if (r < 0) |
f0a4feb0 | 1131 | goto finish; |
417116f2 | 1132 | |
5327c910 | 1133 | r = append_protect_system(&m, protect_system, false); |
f471b2af | 1134 | if (r < 0) |
f0a4feb0 | 1135 | goto finish; |
417116f2 | 1136 | |
e908468b | 1137 | if (namespace_info_mount_apivfs(root, ns_info)) { |
5d997827 LP |
1138 | r = append_static_mounts(&m, apivfs_table, ELEMENTSOF(apivfs_table), ns_info->ignore_protect_paths); |
1139 | if (r < 0) | |
1140 | goto finish; | |
1141 | } | |
1142 | ||
f0a4feb0 | 1143 | assert(mounts + n_mounts == m); |
ac0930c8 | 1144 | |
5327c910 | 1145 | /* Prepend the root directory where that's necessary */ |
e908468b | 1146 | r = prefix_where_needed(mounts, n_mounts, root); |
5327c910 LP |
1147 | if (r < 0) |
1148 | goto finish; | |
1149 | ||
34de407a | 1150 | qsort(mounts, n_mounts, sizeof(MountEntry), mount_path_compare); |
fe3c2583 | 1151 | |
f0a4feb0 | 1152 | drop_duplicates(mounts, &n_mounts); |
e908468b | 1153 | drop_outside_root(root, mounts, &n_mounts); |
f0a4feb0 DH |
1154 | drop_inaccessible(mounts, &n_mounts); |
1155 | drop_nop(mounts, &n_mounts); | |
15ae422b LP |
1156 | } |
1157 | ||
d944dc95 LP |
1158 | if (unshare(CLONE_NEWNS) < 0) { |
1159 | r = -errno; | |
1160 | goto finish; | |
1161 | } | |
1e4e94c8 | 1162 | |
d944dc95 | 1163 | if (make_slave) { |
c2c13f2d LP |
1164 | /* Remount / as SLAVE so that nothing now mounted in the namespace |
1165 | shows up in the parent */ | |
d944dc95 LP |
1166 | if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL) < 0) { |
1167 | r = -errno; | |
1168 | goto finish; | |
1169 | } | |
ee818b89 AC |
1170 | } |
1171 | ||
915e6d16 | 1172 | if (root_image) { |
e908468b | 1173 | /* A root image is specified, mount it to the right place */ |
2d3a5a73 | 1174 | r = dissected_image_mount(dissected_image, root, UID_INVALID, dissect_image_flags); |
915e6d16 LP |
1175 | if (r < 0) |
1176 | goto finish; | |
1177 | ||
07ce7407 TM |
1178 | if (decrypted_image) { |
1179 | r = decrypted_image_relinquish(decrypted_image); | |
1180 | if (r < 0) | |
1181 | goto finish; | |
1182 | } | |
78ebe980 | 1183 | |
915e6d16 LP |
1184 | loop_device_relinquish(loop_device); |
1185 | ||
1186 | } else if (root_directory) { | |
1187 | ||
e908468b LP |
1188 | /* A root directory is specified. Turn its directory into bind mount, if it isn't one yet. */ |
1189 | r = path_is_mount_point(root, NULL, AT_SYMLINK_FOLLOW); | |
8f1ad200 | 1190 | if (r < 0) |
d944dc95 | 1191 | goto finish; |
8f1ad200 | 1192 | if (r == 0) { |
e908468b | 1193 | if (mount(root, root, NULL, MS_BIND|MS_REC, NULL) < 0) { |
8f1ad200 LP |
1194 | r = -errno; |
1195 | goto finish; | |
1196 | } | |
d944dc95 | 1197 | } |
e908468b LP |
1198 | |
1199 | } else if (root) { | |
1200 | ||
1201 | /* Let's mount the main root directory to the root directory to use */ | |
1202 | if (mount("/", root, NULL, MS_BIND|MS_REC, NULL) < 0) { | |
1203 | r = -errno; | |
1204 | goto finish; | |
1205 | } | |
ee818b89 | 1206 | } |
c2c13f2d | 1207 | |
4e0c20de LP |
1208 | /* Try to set up the new root directory before mounting anything else there. */ |
1209 | if (root_image || root_directory) | |
1210 | (void) base_filesystem_create(root, UID_INVALID, GID_INVALID); | |
1211 | ||
f0a4feb0 | 1212 | if (n_mounts > 0) { |
ac9de0b3 | 1213 | _cleanup_fclose_ FILE *proc_self_mountinfo = NULL; |
6b7c9f8b LP |
1214 | char **blacklist; |
1215 | unsigned j; | |
1216 | ||
ac9de0b3 TR |
1217 | /* Open /proc/self/mountinfo now as it may become unavailable if we mount anything on top of /proc. |
1218 | * For example, this is the case with the option: 'InaccessiblePaths=/proc' */ | |
1219 | proc_self_mountinfo = fopen("/proc/self/mountinfo", "re"); | |
1220 | if (!proc_self_mountinfo) { | |
1221 | r = -errno; | |
1222 | goto finish; | |
1223 | } | |
1224 | ||
6b7c9f8b | 1225 | /* First round, add in all special mounts we need */ |
f0a4feb0 | 1226 | for (m = mounts; m < mounts + n_mounts; ++m) { |
e908468b | 1227 | r = apply_mount(root, m, tmp_dir, var_tmp_dir); |
c2c13f2d | 1228 | if (r < 0) |
d944dc95 | 1229 | goto finish; |
c2c13f2d | 1230 | } |
15ae422b | 1231 | |
6b7c9f8b | 1232 | /* Create a blacklist we can pass to bind_mount_recursive() */ |
f0a4feb0 DH |
1233 | blacklist = newa(char*, n_mounts+1); |
1234 | for (j = 0; j < n_mounts; j++) | |
34de407a | 1235 | blacklist[j] = (char*) mount_entry_path(mounts+j); |
6b7c9f8b LP |
1236 | blacklist[j] = NULL; |
1237 | ||
1238 | /* Second round, flip the ro bits if necessary. */ | |
f0a4feb0 | 1239 | for (m = mounts; m < mounts + n_mounts; ++m) { |
ac9de0b3 | 1240 | r = make_read_only(m, blacklist, proc_self_mountinfo); |
c2c13f2d | 1241 | if (r < 0) |
d944dc95 | 1242 | goto finish; |
c2c13f2d | 1243 | } |
15ae422b LP |
1244 | } |
1245 | ||
e908468b | 1246 | if (root) { |
ee818b89 | 1247 | /* MS_MOVE does not work on MS_SHARED so the remount MS_SHARED will be done later */ |
e908468b | 1248 | r = mount_move_root(root); |
d944dc95 LP |
1249 | if (r < 0) |
1250 | goto finish; | |
ee818b89 AC |
1251 | } |
1252 | ||
c2c13f2d LP |
1253 | /* Remount / as the desired mode. Not that this will not |
1254 | * reestablish propagation from our side to the host, since | |
1255 | * what's disconnected is disconnected. */ | |
d944dc95 LP |
1256 | if (mount(NULL, "/", NULL, mount_flags | MS_REC, NULL) < 0) { |
1257 | r = -errno; | |
1258 | goto finish; | |
1259 | } | |
15ae422b | 1260 | |
d944dc95 | 1261 | r = 0; |
15ae422b | 1262 | |
d944dc95 | 1263 | finish: |
f0a4feb0 | 1264 | for (m = mounts; m < mounts + n_mounts; m++) |
1eb7e08e | 1265 | mount_entry_done(m); |
613b411c LP |
1266 | |
1267 | return r; | |
1268 | } | |
1269 | ||
d2d6c096 LP |
1270 | void bind_mount_free_many(BindMount *b, unsigned n) { |
1271 | unsigned i; | |
1272 | ||
1273 | assert(b || n == 0); | |
1274 | ||
1275 | for (i = 0; i < n; i++) { | |
1276 | free(b[i].source); | |
1277 | free(b[i].destination); | |
1278 | } | |
1279 | ||
1280 | free(b); | |
1281 | } | |
1282 | ||
1283 | int bind_mount_add(BindMount **b, unsigned *n, const BindMount *item) { | |
1284 | _cleanup_free_ char *s = NULL, *d = NULL; | |
1285 | BindMount *c; | |
1286 | ||
1287 | assert(b); | |
1288 | assert(n); | |
1289 | assert(item); | |
1290 | ||
1291 | s = strdup(item->source); | |
1292 | if (!s) | |
1293 | return -ENOMEM; | |
1294 | ||
1295 | d = strdup(item->destination); | |
1296 | if (!d) | |
1297 | return -ENOMEM; | |
1298 | ||
1299 | c = realloc_multiply(*b, sizeof(BindMount), *n + 1); | |
1300 | if (!c) | |
1301 | return -ENOMEM; | |
1302 | ||
1303 | *b = c; | |
1304 | ||
1305 | c[(*n) ++] = (BindMount) { | |
1306 | .source = s, | |
1307 | .destination = d, | |
1308 | .read_only = item->read_only, | |
1309 | .recursive = item->recursive, | |
1310 | .ignore_enoent = item->ignore_enoent, | |
1311 | }; | |
1312 | ||
1313 | s = d = NULL; | |
1314 | return 0; | |
1315 | } | |
1316 | ||
613b411c LP |
1317 | static int setup_one_tmp_dir(const char *id, const char *prefix, char **path) { |
1318 | _cleanup_free_ char *x = NULL; | |
6b46ea73 LP |
1319 | char bid[SD_ID128_STRING_MAX]; |
1320 | sd_id128_t boot_id; | |
1321 | int r; | |
613b411c LP |
1322 | |
1323 | assert(id); | |
1324 | assert(prefix); | |
1325 | assert(path); | |
1326 | ||
6b46ea73 LP |
1327 | /* We include the boot id in the directory so that after a |
1328 | * reboot we can easily identify obsolete directories. */ | |
1329 | ||
1330 | r = sd_id128_get_boot(&boot_id); | |
1331 | if (r < 0) | |
1332 | return r; | |
1333 | ||
605405c6 | 1334 | x = strjoin(prefix, "/systemd-private-", sd_id128_to_string(boot_id, bid), "-", id, "-XXXXXX"); |
613b411c LP |
1335 | if (!x) |
1336 | return -ENOMEM; | |
1337 | ||
1338 | RUN_WITH_UMASK(0077) | |
1339 | if (!mkdtemp(x)) | |
1340 | return -errno; | |
1341 | ||
1342 | RUN_WITH_UMASK(0000) { | |
1343 | char *y; | |
1344 | ||
63c372cb | 1345 | y = strjoina(x, "/tmp"); |
613b411c LP |
1346 | |
1347 | if (mkdir(y, 0777 | S_ISVTX) < 0) | |
1348 | return -errno; | |
c17ec25e | 1349 | } |
15ae422b | 1350 | |
613b411c LP |
1351 | *path = x; |
1352 | x = NULL; | |
1353 | ||
1354 | return 0; | |
1355 | } | |
1356 | ||
1357 | int setup_tmp_dirs(const char *id, char **tmp_dir, char **var_tmp_dir) { | |
1358 | char *a, *b; | |
1359 | int r; | |
1360 | ||
1361 | assert(id); | |
1362 | assert(tmp_dir); | |
1363 | assert(var_tmp_dir); | |
1364 | ||
1365 | r = setup_one_tmp_dir(id, "/tmp", &a); | |
1366 | if (r < 0) | |
1367 | return r; | |
1368 | ||
1369 | r = setup_one_tmp_dir(id, "/var/tmp", &b); | |
1370 | if (r < 0) { | |
1371 | char *t; | |
1372 | ||
63c372cb | 1373 | t = strjoina(a, "/tmp"); |
613b411c LP |
1374 | rmdir(t); |
1375 | rmdir(a); | |
1376 | ||
1377 | free(a); | |
1378 | return r; | |
1379 | } | |
1380 | ||
1381 | *tmp_dir = a; | |
1382 | *var_tmp_dir = b; | |
1383 | ||
1384 | return 0; | |
1385 | } | |
1386 | ||
1387 | int setup_netns(int netns_storage_socket[2]) { | |
1388 | _cleanup_close_ int netns = -1; | |
3ee897d6 | 1389 | int r, q; |
613b411c LP |
1390 | |
1391 | assert(netns_storage_socket); | |
1392 | assert(netns_storage_socket[0] >= 0); | |
1393 | assert(netns_storage_socket[1] >= 0); | |
1394 | ||
1395 | /* We use the passed socketpair as a storage buffer for our | |
76cd584b LP |
1396 | * namespace reference fd. Whatever process runs this first |
1397 | * shall create a new namespace, all others should just join | |
1398 | * it. To serialize that we use a file lock on the socket | |
1399 | * pair. | |
613b411c LP |
1400 | * |
1401 | * It's a bit crazy, but hey, works great! */ | |
1402 | ||
1403 | if (lockf(netns_storage_socket[0], F_LOCK, 0) < 0) | |
1404 | return -errno; | |
1405 | ||
3ee897d6 LP |
1406 | netns = receive_one_fd(netns_storage_socket[0], MSG_DONTWAIT); |
1407 | if (netns == -EAGAIN) { | |
613b411c LP |
1408 | /* Nothing stored yet, so let's create a new namespace */ |
1409 | ||
1410 | if (unshare(CLONE_NEWNET) < 0) { | |
1411 | r = -errno; | |
1412 | goto fail; | |
1413 | } | |
1414 | ||
1415 | loopback_setup(); | |
1416 | ||
1417 | netns = open("/proc/self/ns/net", O_RDONLY|O_CLOEXEC|O_NOCTTY); | |
1418 | if (netns < 0) { | |
1419 | r = -errno; | |
1420 | goto fail; | |
1421 | } | |
1422 | ||
1423 | r = 1; | |
613b411c | 1424 | |
3ee897d6 LP |
1425 | } else if (netns < 0) { |
1426 | r = netns; | |
1427 | goto fail; | |
613b411c | 1428 | |
3ee897d6 LP |
1429 | } else { |
1430 | /* Yay, found something, so let's join the namespace */ | |
613b411c LP |
1431 | if (setns(netns, CLONE_NEWNET) < 0) { |
1432 | r = -errno; | |
1433 | goto fail; | |
1434 | } | |
1435 | ||
1436 | r = 0; | |
1437 | } | |
1438 | ||
3ee897d6 LP |
1439 | q = send_one_fd(netns_storage_socket[1], netns, MSG_DONTWAIT); |
1440 | if (q < 0) { | |
1441 | r = q; | |
613b411c LP |
1442 | goto fail; |
1443 | } | |
1444 | ||
1445 | fail: | |
fe048ce5 | 1446 | (void) lockf(netns_storage_socket[0], F_ULOCK, 0); |
15ae422b LP |
1447 | return r; |
1448 | } | |
417116f2 | 1449 | |
6e2d7c4f MS |
1450 | bool ns_type_supported(NamespaceType type) { |
1451 | const char *t, *ns_proc; | |
1452 | ||
0fa5b831 LP |
1453 | t = namespace_type_to_string(type); |
1454 | if (!t) /* Don't know how to translate this? Then it's not supported */ | |
6e2d7c4f MS |
1455 | return false; |
1456 | ||
6e2d7c4f | 1457 | ns_proc = strjoina("/proc/self/ns/", t); |
6e2d7c4f MS |
1458 | return access(ns_proc, F_OK) == 0; |
1459 | } | |
1460 | ||
1b8689f9 LP |
1461 | static const char *const protect_home_table[_PROTECT_HOME_MAX] = { |
1462 | [PROTECT_HOME_NO] = "no", | |
1463 | [PROTECT_HOME_YES] = "yes", | |
1464 | [PROTECT_HOME_READ_ONLY] = "read-only", | |
417116f2 LP |
1465 | }; |
1466 | ||
1b8689f9 LP |
1467 | DEFINE_STRING_TABLE_LOOKUP(protect_home, ProtectHome); |
1468 | ||
5e1c6154 YW |
1469 | ProtectHome parse_protect_home_or_bool(const char *s) { |
1470 | int r; | |
1471 | ||
1472 | r = parse_boolean(s); | |
1473 | if (r > 0) | |
1474 | return PROTECT_HOME_YES; | |
1475 | if (r == 0) | |
1476 | return PROTECT_HOME_NO; | |
1477 | ||
1478 | return protect_home_from_string(s); | |
1479 | } | |
1480 | ||
1b8689f9 LP |
1481 | static const char *const protect_system_table[_PROTECT_SYSTEM_MAX] = { |
1482 | [PROTECT_SYSTEM_NO] = "no", | |
1483 | [PROTECT_SYSTEM_YES] = "yes", | |
1484 | [PROTECT_SYSTEM_FULL] = "full", | |
3f815163 | 1485 | [PROTECT_SYSTEM_STRICT] = "strict", |
1b8689f9 LP |
1486 | }; |
1487 | ||
1488 | DEFINE_STRING_TABLE_LOOKUP(protect_system, ProtectSystem); | |
6e2d7c4f | 1489 | |
03c791aa YW |
1490 | ProtectSystem parse_protect_system_or_bool(const char *s) { |
1491 | int r; | |
1492 | ||
1493 | r = parse_boolean(s); | |
1494 | if (r > 0) | |
1495 | return PROTECT_SYSTEM_YES; | |
1496 | if (r == 0) | |
1497 | return PROTECT_SYSTEM_NO; | |
1498 | ||
1499 | return protect_system_from_string(s); | |
1500 | } | |
1501 | ||
6e2d7c4f MS |
1502 | static const char* const namespace_type_table[] = { |
1503 | [NAMESPACE_MOUNT] = "mnt", | |
1504 | [NAMESPACE_CGROUP] = "cgroup", | |
1505 | [NAMESPACE_UTS] = "uts", | |
1506 | [NAMESPACE_IPC] = "ipc", | |
1507 | [NAMESPACE_USER] = "user", | |
1508 | [NAMESPACE_PID] = "pid", | |
1509 | [NAMESPACE_NET] = "net", | |
1510 | }; | |
1511 | ||
1512 | DEFINE_STRING_TABLE_LOOKUP(namespace_type, NamespaceType); |